linux-kernel - Re: why does the macro "ZERO

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Message-ID: <Pine.LNX.4.64.0706080324280.15839@localhost.localdomain>
Date:	Fri, 8 Jun 2007 03:25:19 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	"H. Peter Anvin" <hpa@...or.com>
cc:	William Lee Irwin III <wli@...omorphy.com>,
	Satyam Sharma <satyam.sharma@...il.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: why does the macro "ZERO_PAGE" take an argument?

On Thu, 7 Jun 2007, H. Peter Anvin wrote:

> William Lee Irwin III wrote:
> > Robert P. J. Day wrote:
> >>> although it's not clear where in the source tree are the invocations
> >>> that would actually make a difference to a MIPS system, which is why
> >>> i've CC'ed ralf on this.  i'm sure he can clear this up. :-)
> >
> > On Thu, Jun 07, 2007 at 10:32:29AM -0700, H. Peter Anvin wrote:
> >> x86 could also benefit from coloured zeropages.  In fact, I thought it
> >> already had them (K8 wants as many as 8.)
> >
> > How would one demonstrate the beneficial effect of such?
>
> Dean Gaudet at Transmeta did some benchmarking using SPEC.  If I
> recall his numbers correctly (this is from memory, mind you) on
> Transmeta Efficeon, which has 2-way virtual cache tagging with
> hardware recovery, zeropage coloring was a 1.5% performance
> improvement.

and once again, an initially innocuous question quickly leaves me
behind.  no, no, i'm getting used to it.  :-P

rday

-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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